Stepwise Current Increment Sintering of Silver Nanoparticle Structures

Abstract

Owing to its unique properties, silver (Ag) in the form of nanoparticle (NP) ink promises to play a vital role in the development of printed and flexible electronics. Once printed, metal NP inks require a thermal treatment process called sintering to render them conductive. Among the various methods, electrical sintering is a highly selective and rapid sintering method. Here, we studied the electrical sintering of inkjet-printed Ag NP lines via a stepwise current increment sintering (SCIS) technique. In the SCIS technique, the supplied electric current was gradually increased in multiple steps from low electric currents to higher electric currents to avoid thermal damage to the printed Ag NP ink lines. In less than 0.15 s, a line resistivity as low as 6.8 μΩcm was obtained which was comparable with furnace sintered line resistivity of 6.13 μΩcm obtained at 250 °C in 600 s. Furthermore, a numerical model was developed for the SCIS process temperature estimation. The results enabled us to elaborate on the relationship between the Ag NP line resistivity and the process temperature under various electric currents. Under the applied SCIS technique, a stable sintering process was carried out avoiding the conductive ink line and substrate damage.

Material jetting for advanced applications: A state-of-the-art review, gaps and future directions

“…Solvent-based conductive ink activates its conduction after drying and sintering. In particular, the drying removes remaining solvent of the liquid and the sintering at even higher temperature thermally decomposes the non-conductive outer shell on each metallic nanoparticle to facilitate the agglomeration of the nanoparticles [35,36].…”

Synthesis, Characterization, and Comparison of Pure Zinc Oxide and Magnesium‐Doped Zinc Oxide Nanoparticles and their Application on Ethanol Sensing Activities

“…The FT-IR spectra of pure ZnO and Mg-doped ZnO oxide nanoparticles are shown in Figure 4. FTIR analysis is a suitable technique to evaluate the functional groups present in the samples subjected to analysis [30]. The samples shown the bands appeared approximately near 400 cm -1 for Zn-O [31] and the wider band at 320, and a sharp band at 622 cm -1 can be attributed to Mg-O stretching modes.…”